LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Schedule of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Allowance for loan losses
Nonaccrual Amortized Cost	$ 21,407	$ 31,114
Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	10,990	7,878
Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Other
Allowance for loan losses
Nonaccrual Amortized Cost	944	16,931
Construction and commercial multifamily | Construction
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Construction and commercial multifamily | Construction | Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Construction and commercial multifamily | Construction | Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Construction and commercial multifamily | Construction | Other
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Construction and commercial multifamily | Commercial multifamily
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Construction and commercial multifamily | Commercial multifamily | Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Construction and commercial multifamily | Commercial multifamily | Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Construction and commercial multifamily | Commercial multifamily | Other
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Commercial real estate loans | Commercial real estate owner occupied
Allowance for loan losses
Nonaccrual Amortized Cost	605	2,202
Commercial real estate loans | Commercial real estate owner occupied | Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	650	2,793
Commercial real estate loans | Commercial real estate owner occupied | Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Commercial real estate loans | Commercial real estate owner occupied | Other
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Commercial real estate loans | Commercial real estate non-owner occupied
Allowance for loan losses
Nonaccrual Amortized Cost	3,798	191
Commercial real estate loans | Commercial real estate non-owner occupied | Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	342	384
Commercial real estate loans | Commercial real estate non-owner occupied | Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Commercial real estate loans | Commercial real estate non-owner occupied | Other
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Commercial and industrial loans
Allowance for loan losses
Nonaccrual Amortized Cost	8,665	16,992
Commercial and industrial loans | Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	4,788	288
Commercial and industrial loans | Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Commercial and industrial loans | Other
Allowance for loan losses
Nonaccrual Amortized Cost	944	16,931
Residential real estate | Residential real estate
Allowance for loan losses
Nonaccrual Amortized Cost	6,696	8,901
Residential real estate | Residential real estate | Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	5,035	3,910
Residential real estate | Residential real estate | Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Residential real estate | Residential real estate | Other
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Consumer loans | Home equity
Allowance for loan losses
Nonaccrual Amortized Cost	961	1,568
Consumer loans | Home equity | Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	135	501
Consumer loans | Home equity | Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Consumer loans | Home equity | Other
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Consumer loans | Consumer other
Allowance for loan losses
Nonaccrual Amortized Cost	682	1,260
Consumer loans | Consumer other | Real Estate
Allowance for loan losses
Nonaccrual Amortized Cost	40	2
Consumer loans | Consumer other | Investment Securities/Cash
Allowance for loan losses
Nonaccrual Amortized Cost	0	0
Consumer loans | Consumer other | Other
Allowance for loan losses
Nonaccrual Amortized Cost	$ 0	$ 0